WO2018025535A1

WO2018025535A1 - Movable body system

Info

Publication number: WO2018025535A1
Application number: PCT/JP2017/023427
Authority: WO
Inventors: 山田　正明; 森　和久; 大沼　直人; 洋平松本
Original assignee: 株式会社日立製作所
Priority date: 2016-08-03
Filing date: 2017-06-26
Publication date: 2018-02-08
Also published as: JP2018020877A; JP6727065B2

Abstract

The present invention detects a relative position of a coil in a short time and ensures a power feed time period, in an elevator in which power is fed to a cage while the cage is stopped. A movable body system according to the present invention is provided with: a movable body; a first power transmitting device and a second power transmitting device provided around the movable body; a first power receiving device which is provided on a first surface of the movable body and to which power is fed from the first power transmitting device in a noncontact manner; and a second power receiving device which is provided on the first surface and to which power is fed from the second power transmitting device in a noncontact manner, wherein the coupling rate of the first power transmitting device and the first power receiving device and the coupling rate of the second power transmitting device and the second power receiving device are reciprocal due to positional shift of the movable body, and power is fed by the first power transmitting device and the second power transmitting device.

Description

Mobile system

The present invention relates to a mobile system using non-contact power feeding.

A general elevator, which is one of mobile system systems, supplies power to equipment in a car through a feed line called a tail cord that is suspended from the car. Along with the increase in length, the tail cord becomes longer and the mass increases, and if it exceeds a certain length, there is a concern that it cannot withstand its own weight. Therefore, an elevator without a tail cord is desired for the ultra-long journey, and power supply to in-car equipment becomes a problem. As a method for supplying power to the in-car device, for example, as shown in Patent Document 1, there is a method in which an induction wire is stretched so as to be substantially parallel to the moving direction and current is taken out by the power receiving coil. A method is shown in which a guide wire is laid one by one at a symmetrical position around the center of the car, one power receiving unit is provided on each side, and a substantially constant current is taken out even if the car is shifted left and right. . Patent Document 2 discloses a method for supplying power to a slide door from two power transmission units provided on an upper frame of an elevator car.

JP 2001-310879 A JP 2013-133180 A

However, since Patent Document 1 cannot cope with the front-back displacement, there is a concern that the current that can be taken out decreases, that is, the efficiency decreases. In addition, since it is necessary to attach the two guide wires to a symmetrical position at a long distance and with high accuracy, the installation property is lowered, and there are peripherals such as a weight, a position detection device, and a safety device around the car. There is a risk that the occupied area of the will increase. In Patent Document 2, two power transmission units are provided on the door side surface of the car, but a positional shift occurs.

In view of the above, it is an object of the present invention to provide a non-contact power feeding device that can be installed in a mobile system that performs non-contact power feeding, has good installation characteristics, and can reduce the influence of all the positional deviations in the front, rear, left, and right. One.

In order to solve at least one of the above problems, according to one embodiment of the present invention, a mobile body, a first power transmission device and a second power transmission device provided around the mobile body, and the first power transmission A first power receiving device provided on the first surface of the moving body fed in a contactless manner from the device, and a first power receiving device provided on the first surface fed in a contactless manner from the second power transmission device. The coupling rate between the first power transmission device and the first power reception device, and the coupling rate between the second power transmission device and the second power reception device are contradictory due to the displacement of the moving body. In addition, power is supplied by the first power transmission device and the second power transmission device.

According to one embodiment of the present invention, a reduction in power supply efficiency can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the apparatus which shows Example 1 of this invention. It is a bird's-eye view in Example 1 of the present invention. It is a schematic block diagram of the power transmission apparatus in Example 1 of this invention. It is a schematic block diagram of the power receiving apparatus in Example 1 of this invention. It is the figure which showed the space | gap of the apparatus in Example 1 of this invention. It is the figure which showed the position shift of the X direction in Example 1 of this invention. It is a figure which shows the coupling rate with respect to the position shift of the X direction in Example 1 of this invention. It is the figure which showed the position shift of the Z direction in Example 1 of this invention. It is a figure which shows the coupling rate with respect to the position shift of the Z direction in Example 1 of this invention. It is a block diagram of the modification of the apparatus installation in Example 1 of this invention. It is a figure which shows the modification of power transmission apparatus installation in Example 1 of this invention. It is a schematic block diagram of the apparatus which shows the modification of Example 1 of this invention. It is a schematic block diagram of the apparatus which shows the other modification of Example 1 of this invention. It is a block diagram of the modification of the apparatus installation in the other modification of Example 1 in this invention.

Embodiments of the present invention will be described with reference to the drawings. In each drawing and each embodiment, the same or similar components are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 and FIG. 2 are schematic configuration diagrams showing an elevator which is a mobile system equipped with a power feeding apparatus in the first mode for embodying the present invention (embodiment 1). The mobile body system includes a mobile body 4,

guide rails

4 a and 4 b, a control unit 5,

power transmission devices

21 and 22, and

power reception devices

31 and 32.

The moving body 4 is an elevator car and moves in a direction perpendicular to the paper surface in FIG. In addition, the moving body 4 moves in the positive and negative directions of the y-axis in FIG. The

guide rails

4a and 4b are installed along the moving direction of the elevator. The control unit 5 controls the operation of the elevator, the stop and speed of the car 4, the power supply to peripheral devices (not shown), and the like. The power storage device 7 is a lead storage battery, a lithium ion battery, a capacitor, or the like that stores the received power. The

power transmission devices

21 and 22 perform non-contact power feeding and are installed in the hoistway. The power receiving

devices

31 and 32 perform non-contact power feeding, and the

power receiving devices

31 and 32 are attached to one surface of the car 4 and installed in opposite directions. The power transmission circuit 10 supplies power to at least one of the

power transmission devices

21 and 22.

Gzl is a gap between the power transmission device 21 and the power reception device 31 in the Z direction, and Gzr is a gap between the power transmission device 22 and the power reception device 32 in the Z direction. Gx is a gap between the

power transmission devices

21 and 22 and the

power reception devices

31 and 32 in the X direction. The controller 5 determines from the information acquired by the position detection device 42 that the

power transmission devices

21 and 22 have arrived at the power supply floor. The control unit 5 checks the remaining battery level of the power storage device 7, turns on the power transmission circuit if charging is necessary, and receives power at the

power reception devices

31 and 32 via the

power transmission devices

21 and 22, respectively. The power receiving circuit 6 receives power from at least one of the power receiving

devices

31 and 32 and charges the power storage device 7 with the received power.

The moving body system includes a door 43, a rope 44, a counterweight 40, a governor 41, and a position detection device 42. The position detection device 42 detects the position of the moving body 4. The door 43 is driven in order for a cargo to enter and exit the moving body 4. The rope 44 suspends the car 4 to raise and lower the car 4.

FIG. 3 shows details of the power transmission device 21. 3A is a view as seen from the XZ plane, and FIG. 3B is a view as seen from the XY plane. Reference numeral 210 denotes a power transmission coil in which an electric wire such as a litz wire is wound. Although not shown, both ends of the coil are connected to a power transmission circuit. Reference numeral 212 denotes a magnetic ferrite that forms a magnetic path of magnetic flux generated in the power transmission coil 210. Reference numeral 213 denotes a support such as aluminum that supports the power transmission coil 210 and the ferrite 212 and shields the magnetic field. Reference numeral 214 denotes a coil support made of a nonmagnetic material or a nonmetal.

FIG. 4 shows details of the power receiving device 31. 4A is a view of the XZ plane, and FIG. 4B is a view of the cross section of the A-A ′ plane of FIG. 4A viewed from the XY plane. Reference numeral 310 denotes a power receiving coil similar to the power transmitting coil 210, and obtains electric power by interlinking the magnetic flux generated in the power transmitting coil 210. Reference numeral 312 denotes a magnetic ferrite. Reference numeral 313 denotes a support such as aluminum that supports the coil and shields the magnetic field.

FIG. 5 is a configuration diagram showing details of the

power transmission devices

21 and 22 and the

power reception devices

31 and 32 when the car 4 is in a desired position. Gzl is a gap in the Z direction between the power transmission coil 210 and the power reception coil 310. Gzr is a gap in the Z direction between the power transmission coil 220 and the power reception coil 320. Gx1 is the shortest gap in the X direction between the power transmission coil 210 and the ferrite 312. Gx2 is the shortest gap in the X direction between the power transmission coil 220 and the ferrite 322, and is in an inversely proportional relationship with Gx1.

FIG. 6 is a configuration diagram when the car 4 is displaced in the X direction from the desired power feeding position. FIG. 7 shows the coupling rate between the power transmitting device and the power receiving device with the positional deviation X as the horizontal axis. The gap Gzl and the gap Gzr are almost equal, and Gx1> Gx2. Based on the case where X = 0 and no positional deviation is used as a reference, under the condition of Gx1> Gx2 where the positional deviation X is large, the power transmitting device 21 and the power receiving device 31 are separated, so that the coupling becomes small. On the other hand, the power transmission device 22 and the power reception device 32 approach each other and the coupling increases. Under the condition of Gx1 <Gx2 where the positional deviation X is small, the characteristics are opposite to those described above. Thus, by attaching the power receiving device 32 in the opposite direction with respect to the mounting direction of the power receiving device 31 on one surface of the car and attaching the power transmitting device 21 and the power transmitting device 22 respectively, it is possible to obtain characteristics that conflict with the deviation. .

FIG. 8 is a configuration diagram when the car 4 is displaced in the −Z direction from a desired power supply position, and FIG. 9 is a coupling rate of each power transmitting apparatus and power receiving apparatus with the position deviation Z as a horizontal axis. The gap Gx1 and the gap Gx2 are almost equal, and Gzl> Gzr. In a power feeding device in which two planar coils having a coil axis in the Z direction as a comparison target are opposed to each other, the variation of the coupling rate varies by about 30% from -10 mm to 10 mm. On the other hand, since the transformer of the present embodiment has a structure in which the power transmission coil is sandwiched between two power reception coils, the

power transmission coil

210 or 220 of the

power transmission device

21 or 22 is replaced with the power reception coil of the

power reception device

31 or 32 with respect to the misalignment in the Z direction. Since it approaches either one of 310 or 320, the variation of the coupling rate is as small as about 4%.

With the above configuration, it is possible to provide a mobile system using a non-contact power feeding device in which two power feeding devices are concentrated on one surface of a car and a coupling rate variation is small with respect to a positional shift.

In this embodiment, the power feeding device is installed on one side of the car, but the present invention is not limited to this. For example, you may arrange | position in the position offset from a certain surface like FIG. Thereby, it is applicable also to the shape of various hoistways.

In addition, although the

power transmission apparatuses

21 and 22 were attached to the hoistway, it is not restricted to this. For example, as shown in FIG. 11, by attaching the

support members

213 and 223 of the power transmission device to the guide rail 4b, wiring from the power transmission device can be collected, so that space saving can be achieved, unnecessary wiring can be reduced, and installation efficiency is improved. Further, the

power transmission devices

21 and 22 may be used for power reception, and the

power reception devices

31 and 32 may be used for power transmission, or may be combined in consideration of the installation space and the surrounding structure.

FIG. 12 is a schematic configuration diagram showing an elevator using a non-contact power feeding device which is one of modifications of the above-described embodiment. In the above-described embodiment, the

power transmission devices

21 and 22 and the

power reception devices

31 and 32 are attached at the same height (Y-axis position), but in this embodiment, the power transmission device 21 and the power reception device 31, the power transmission device 22 and the power reception device 32. Mounting height is different. When a position shift occurs due to the rotation of the car 4 around the Z axis, when the power transmission device 21 approaches the power reception device 31, the power transmission device 22 and the power reception device 32 are separated from each other. Variations in the coupling rate due to deviation can be offset.

With the above configuration, space can be saved because it is installed on one side of the car, and the fluctuation of the coupling rate is reduced and the efficiency is improved with respect to the positional deviation caused by the rotation of the car 4 around the Z axis.

FIG. 13 is a schematic configuration diagram showing an elevator using a non-contact power feeding device which is one of modifications of the above-described embodiment.

In the above embodiment, power is supplied by two power transmission devices and a power reception device. In this embodiment, power is supplied by three or more power transmission devices and power reception devices. The power transmission device 23 is disposed at a position where the power transmission device 21 is translated in the Y direction, and the power transmission device 24 is disposed at a position where the power transmission device 22 is translated in the Y direction. Further, the power receiving device 33 is arranged at a position where the power receiving device 31 is translated in the Y direction, and the power receiving device 34 is arranged at a position where the power receiving device 32 is translated in the Y direction.

With the above configuration, since the installation is performed on one side of the car, the variation in the coupling rate is reduced with respect to the space saving and the car 4 position shift, the efficiency is improved, and it is possible to transmit high power.

Although power receiving devices are arranged at the four corners of one side of the car, the present invention is not limited to this. For example, as shown in FIG. 14, the

power transmission devices

21 and 22 may be attached to the hoistway and the

power transmission devices

23 and 24 may be attached to the guide rail 4b. Further, by installing the power transmitting device and the power receiving device at the same height (position of the Y axis), the installability and maintainability are improved. As described above, if the respective installation positions are changed, it is possible to cope with a shift due to rotation. Further, when large power is not transmitted, energy may be saved by turning off one or more power transmission devices.

Although one power transmission circuit 10 supplies power to each power transmission device, the present invention is not limited to this. The power transmission circuit 10 may include an inverter for each power transmission device, or may have a separate structure in which each power transmission device has a power transmission circuit.

That is, by using the above-described embodiment, it is possible to suppress a reduction in efficiency by suppressing fluctuations in the coupling coefficient with two power supply units with respect to all the positional deviations in the front, rear, left, and right directions. Since it can be attached to one surface of the moving body according to the above-described embodiment, it is possible to save space and improve installation.

DESCRIPTION OF SYMBOLS 4 ...

Car

4a, 4b ... Guide rail, 5 ... Control part, 6 ... Power receiving circuit, 7 ... Power storage device, 10 ... Power transmission circuit, 21, 22, 23, 24 ...

Power transmission device

31, 32, 33, 34 ... Power receiving device, 40 ... Counterweight, 41 ... Governor, 42 ... Position detection device, 43 ... Door, 44 ... ·rope

Claims

A moving object,
A first power transmission device and a second power transmission device provided around the mobile body;
A first power receiving device provided on a first surface of the moving body to be fed in a non-contact manner from the first power transmitting device;
A second power receiving device provided on the first surface and fed in a non-contact manner from the second power transmitting device;
The coupling rate between the first power transmitting device and the first power receiving device and the coupling rate between the second power transmitting device and the second power receiving device are contradictory due to misalignment different from the moving direction of the moving body. And the mobile system characterized by supplying electric power with said 1st power transmission apparatus and said 2nd power transmission apparatus.
The mobile system according to claim 1,
At least one of the first and second power transmission devices is
A first coil wound with a conductive wire, and a magnetic body;
A moving body system, wherein a first magnetic body is positioned on a vertical plane with respect to a radial direction of the first coil.
The mobile system according to claim 2, wherein
At least one of the first and second power receiving devices is
A second coil wound with a conductive wire;
A second magnetic body disposed on the back surface of the second coil;
A third coil facing the coaxial line of the second coil;
A third magnetic body disposed on the back surface of the third coil;
A moving body system, wherein a fourth magnetic body is disposed between the second magnetic body and the third magnetic body.
The mobile system according to claim 3,
The first coil is located between the second coil and the third coil;
The moving body system, wherein the first to fourth magnetic bodies occupy four faces of a hexahedron.
The mobile system according to claim 1,
At least one of the first and second power receiving devices is
A first coil wound with a conductive wire;
A magnetic body,
A moving body system, wherein a first magnetic body is positioned on a vertical plane with respect to a radial direction of the first coil.
The mobile system according to claim 1,
At least one of the first and second power transmission devices is
A second coil wound with a conductive wire;
A second magnetic body disposed on the back surface of the second coil;
A third coil facing the coaxial line of the second coil;
A third magnetic body disposed on the back surface of the third coil;
A moving body system, wherein a fourth magnetic body is disposed between the second magnetic body and the third magnetic body.
The mobile system according to any one of claims 2 to 6,
The first power receiving device is installed on the first surface;
The second power receiving device is installed at a position that is offset in parallel to the first surface from a position that is plane-symmetric to the first power receiving device with respect to a surface perpendicular to the first surface. Mobile system.
A mobile system according to any one of claims 2 to 4, wherein
The moving body is an elevator car, and the car moves along a guide rail;
The mobile body system, wherein the first power transmission device and the second power transmission device are attached to a guide rail.
The mobile system according to any one of claims 1 to 7,
A moving body system, wherein the first power receiving apparatus and the second power receiving apparatus have different installation positions in the direction of the moving body.
A mobile system according to any one of claims 1 to 7 and 9, wherein
A third power receiving device provided on the first surface and fed in a non-contact manner from a third power transmitting device;
A fourth power receiving device provided on the first surface and fed in a non-contact manner from a fourth power transmitting device,
The mobile system, wherein the third power transmission device and the fourth power transmission device are attached to a guide rail.
The mobile system according to claim 8, wherein
A moving body system, wherein the first power receiving apparatus and the second power receiving apparatus have different installation positions in the direction of the moving body.
The mobile system according to claim 8 or 11,
A third power receiving device provided on the first surface and fed in a non-contact manner from a third power transmitting device;
A fourth power receiving device provided on the first surface and fed in a non-contact manner from a fourth power transmitting device,
The mobile system characterized in that the third power transmission device and the fourth power transmission device are attached to the guide rail.